Kivy:如何使小部件表现得像溢出:隐藏 [英] Kivy: How to make widget behave like overflow:hidden

问题描述

我想在 Kivy 中创建带有许多矩形按钮的 GridLayout，其中包含一些不同大小的自定义图像.为此，我想缩放图像(我想这样做的方式如下所示)，然后裁剪/隐藏溢出小部件边框的部分.调整大小效果很好，但我不知道如何隐藏/裁剪矩形之外的部分.例如:如果小部件的尺寸为 10 像素 x 10 像素，而我的图像为 100 像素 x 200 像素，我会将其调整为 10 像素 x 20 像素并在小部件中居中，但下方和上方的 5 像素将可见.我不要那个.:) 云有人帮我解决这个问题吗?

I want to create GridLayout in Kivy with many rectangle buttons with some custom images with different size. To do so, I want to scale image (the way I wan to do this is shown below) and then crop/hide the parts that overflow the widget borders. The resizing works nice, but I can not figure out how to hide/crop that parts which are outside the rectangle. For example: if widget have dimensions of 10px x 10px and my image is 100px x 200px I will rezise it to 10px x 20px and center it in widget, but the 5px below and abowe will be visible. I do not want that. :) Cloud somebody help me with this problem?

class PlaceIcon(Widget):
    def __init__(self,image_path, **kwargs):
        super(PlaceIcon, self).__init__(**kwargs)
        self.bind(size=self.adjust_size)
        self.image = Image(source=image_path)
        self.image_path = image_path  

    def adjust_size(self,*args):
        (a,b) = self.image.texture.size
        (x,y) = self.size
        (x1,y1) = self.pos
        if x > y:
            scale = x/a
        else:
            scale = y/b
        x1 -= (scale*a-x)/2
        y1 -= (scale*b-y)/2
        with self.canvas:
            self.canvas.clear()
            self.background = Rectangle(texture=self.image.texture, pos=(x1,y1), size=(scale*a,scale*b))

推荐答案

我会说看看Texture.get_region:http://kivy.org/docs/api-kivy.graphics.texture.html#kivy.graphics.texture.Texture.get_region

I would say to look at Texture.get_region: http://kivy.org/docs/api-kivy.graphics.texture.html#kivy.graphics.texture.Texture.get_region

因此，您可以只使用要显示和传递的纹理部分，就好像它是完全不同的纹理一样.

So you can use only the part of the texture you want to display and passing as if it was an entirely different texture.

另一种方法是使用 StencilView，但我认为这里的 get_region 更好.

Another way would be to use StencilView, but i think here the get_region is better.

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